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the battery is located in the trunk under the carpet where the spare tire is located, loosen the 10 mm nuts on the terminals and pull them off, gently pull the vent hose from the battery, loosen the bolt for the battery hold down, usually a 13mm or 15mm, remove battery and reverse the process to install

Start with the basics. Check the fuses (all of them) with a test light and be sure you have power to each and that they are good. Then be sure that the power lock relay is good by swapping it with another relay in the fuse block. If the fuses are good and the relay is swapped and the locks still aren't functioning, you may have an issue with the BCM. The BCM can be programmed to change the behavior, but if the car has had water damage, or other stress to the BCM (voltage, heat, etc.), it can sometimes damage the BCM and you will need to replace it and reprogram it at a GM dealership.

Fault with the IAC valve.there maybe a trouble code associated with it also./ Go to your nearby autozone or auto parts retailer and ask them to put a scanner to the car....make note of the codes if any are found. the IAC valve i usually locate don the throttle body and can be removed for inspection and sometimes cleaning using a good throttle body cleaner spray and a pipe cleaner brush.

You have a problem with the blower motor resistor. This is a very commen problem on all gm cars and light trucks. The part is not to pricey. You can find the resistor under the glove box buy the blower motor. Two bolts and out it comes.

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Some starters have 2 bolts and some 3 . Make sure your battery is disconnected. Remove he battery wires and some times you have to wiggle it to get it to move . Run your hand all around the starter to make sure all the bolts our out.

Park your Chevy Cobalt on a level surface, activate the emergency brake and place blocks behind the back tires for safety. Disconnect the negative battery cable with a terminal puller. Raise the front end of the car with a jack for easier access to the starter.
Remove the intercooler pump's outer bracket in models with a 2.0L engine. Place the bolt, and all other nuts and bolts, into the jar for safekeeping until later.
Disconnect the starter electrical connections, including the S-terminal and positive battery cable. Label the wires if you have concern about remembering where they go when you install the new starter.
Unscrew the starter mounting bolts and remove the starter from the vehicle's engine.
Take your malfunctioning starter to the parts store with you. Aftermarket distributors remanufacture most of the starters they sell, so you can likely obtain a partial credit toward your new starter by exchanging your old one. Be sure that you take care not to damage the starter in transit, because the better condition it is in, the more you can get for it.
Purchase a replacement starter that has the same or higher cranking capacity (power rating) as the original starter. Also, match the bolt patterns, drive gears and electrical connections. Your owner's manual may list specifications or the auto parts technician will help you determine them. Download a free owner's manual by registering with the Chevy Owner Center (see Resources).
Install the new starter by reversing the removal process. Torque the starter mounting bolts to 37 foot pounds (50 Nm). Tighten the bolt for the intercooler pump bracket to 15 foot pounds (20 Nm).
Lower your Cobalt back to the ground. Reconnect the negative battery cable. Turn the key in the ignition to see if your new starter motor functions correctly.

If the car died while you where driving it, it sounds like it is the alternator. Did it start right up or did you have to boost it? If you had to boost it to start it again,I would say it is the alt., but if it started right away w/o a boost, it is something else.

I'm sorry to be the one to have to tell you this, but you are going to need a new engine. The connecting rods have welded themselves to the crankshaft, due to oil starvation. That is why it will not turn over, even with a new starter. I would take that starter off and return it for a refund. Just make sure it's clean and doesn't look like it has been installed'

There can be a couple things, nutral saftey switch, AC DELCO, NEUTRAL SAFETY SWITCH Direct Replacement Part For OE Number 24219476 `$68.67 , ignition switch not adjusted correctly, try jumping the starter at the starter to see if the starter is working, of course I have just fixed a car that the guy didn't have the shifter in park, try these things and get back to me

If the whole engine is locked up then you have a blown engine. Easiest way to tell is if the starter will not rotate the engine. Try this just briefly (a second or two). Have someone look to see if the belts move. Generally an engine replacement involves replacing the engine as a "Long Block"which is everything except the external components like the alternator, compressor,and intake manifold. I would never recommend replacing engine as a "short block" as it requires reusing the head from the damaged engine. Hope this helps.

Jasper is the national leader for rebuilt engines.
Been around for a long time and offers a good warranty. try jasperengines.com They will ship the engine to your selected installer. Your other choice is a salvage yard for a "used" engine
Hope this helps